EssC is a specificity determinant for Staphylococcus aureus type VII secretion
EssC is a specificity determinant for Staphylococcus aureus type VII secretion
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EssC 是金黄色葡萄球菌 VII 型分泌的特异性决定因素
DOI:
10.1101/252353
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Jäger F
中科院分区:
文献类型:
--
作者:
Jäger F
The type VII protein secretion system (T7SS) is found in actinobacteria and firmicutes, and plays important roles in virulence and interbacterial competition. A membrane-bound ATPase protein, EssC inStaphylococcus aureus, lies at the heart of the secretion machinery. The EssC protein fromS. aureusstrains can be grouped into four variants (EssC1–EssC4) that display sequence variability in the C-terminal region. Here we show that the EssC2, EssC3 and EssC4 variants can be produced in a strain deleted foressC1, and that they are able to mediate secretion of EsxA, an essential component of the secretion apparatus. They are, however, unable to support secretion of the substrate protein EsxC, which is only encoded inessC1-specific strains. This finding indicates that EssC is a specificity determinant for T7 protein secretion. Our results support a model in which the C-terminal domain of EssC interacts with substrate proteins, whereas EsxA interacts elsewhere.
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